eqn.h

   1 /*      $Id: eqn.h,v 1.1 2018/12/13 05:23:38 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  *
  17  * Public data types for eqn(7) syntax trees.
  18  */
  19
  20 enum    eqn_boxt {
  21         EQN_TEXT,       /* Text, e.g. number, variable, operator, ... */
  22         EQN_SUBEXPR,    /* Nested eqn(7) subexpression. */
  23         EQN_LIST,       /* List, for example in braces. */
  24         EQN_PILE,       /* Vertical pile. */
  25         EQN_MATRIX      /* List of columns. */
  26 };
  27
  28 enum    eqn_fontt {
  29         EQNFONT_NONE = 0,
  30         EQNFONT_ROMAN,
  31         EQNFONT_BOLD,
  32         EQNFONT_FAT,
  33         EQNFONT_ITALIC,
  34         EQNFONT__MAX
  35 };
  36
  37 enum    eqn_post {
  38         EQNPOS_NONE = 0,
  39         EQNPOS_SUP,
  40         EQNPOS_SUBSUP,
  41         EQNPOS_SUB,
  42         EQNPOS_TO,
  43         EQNPOS_FROM,
  44         EQNPOS_FROMTO,
  45         EQNPOS_OVER,
  46         EQNPOS_SQRT,
  47         EQNPOS__MAX
  48 };
  49
  50  /*
  51  * A "box" is a parsed mathematical expression as defined by the eqn.7
  52  * grammar.
  53  */
  54 struct  eqn_box {
  55         struct eqn_box   *parent;
  56         struct eqn_box   *prev;
  57         struct eqn_box   *next;
  58         struct eqn_box   *first;   /* First child node. */
  59         struct eqn_box   *last;    /* Last child node. */
  60         char             *text;    /* Text (or NULL). */
  61         char             *left;    /* Left-hand fence. */
  62         char             *right;   /* Right-hand fence. */
  63         char             *top;     /* Symbol above. */
  64         char             *bottom;  /* Symbol below. */
  65         size_t            expectargs; /* Maximal number of arguments. */
  66         size_t            args;    /* Actual number of arguments. */
  67         int               size;    /* Font size. */
  68 #define EQN_DEFSIZE       INT_MIN
  69         enum eqn_boxt     type;    /* Type of node. */
  70         enum eqn_fontt    font;    /* Font in this box. */
  71         enum eqn_post     pos;     /* Position of the next box. */
  72 };